<!DOCTYPE html>
<html>

	<head>
		<meta charset="UTF-8">
		<title></title>
		<!--[if lt IE 9]>
    <script src="jquery-1.9.0.js"></script>
<![endif]-->
		<!--[if gte IE 9]><!-->
		<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
		<!--<![endif]-->
		<script type="text/javascript">
		</script>
		<style>
			body {
				background-color: #eef;
			}
			
			div {
				padding: 20px;
			}
		</style>
	</head>

	<body>

		<button value="Test" name="Test" id="checkMetaKey">点我！</button>
		<div id="display"></div>
		<script>
			$("#checkMetaKey").click(function(event) {
				$("#display").text(event.metaKey);
			});
		</script>
	</body>

</html>